Hollow auger.



N. E. SWANSON. HOLLOW AUGER. APPLIOATION FILED JUNE 10, 1907.

v Patented Sept. 29, 1908.

I I I l /////////f////// 4 UNITED STATES PATENT OFFICE.

m s s'wAusoN, or DENVER, COLORADO, ASSIGNOR F ONE-HALF TO or DENVER, COLORADO.

ROBERT F. OHLIN,

HOLLOW AUGER.

Bpeciflcationo t Letters Patent. Application filed Juno 1'0, 1907. Serial No. 878,100.

" Patented Sept. 29, 1908.

-; rado, have invented certain new and useful Improvements in Hollow Au ers; and do dec are the following to be a ll, clear, and exact description of the invention, such as .will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a partof this specification. I I

My invention relates to a hollow auger or a device having a boring end provided with a centralopening communicatlng with a hollow body above. a

As my improved device is rotated'in contact with wood, the boring or cutting portion forms an annular groove, in the center of which is located a core which passes upwardly into the hollow body of the auger as the latter enters the wood. The body of the auger above the end is open on one side to allow the shavings to escape around the core or plug during the boring operation.

The object of this device is to form plugs for use in cabinet work where it is desired to conceal the heads of screws, nails, bolts or other fastening devices.

The object of my improved device is to facilitate the accurate formation of plugs of this character, whereby it becomes practicable to conceal the heads of screws or other fastening devices, in such a manner as to make the plug practically invisible since by the use of my improved auger the plug may be cut in such a manner that when inserted in the countersink, above the head of the screw or other device, it practicallK conforms or harmonizes with the grain of t which it is inserted.

Having briefly outlined my improved construction as well as the functlon it is intended to perform, I will proceed to describe the same in detail reference being made to the accompany' g drawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is aside elevation of my improved auger viewed from'the side where the shank is open. Fig.2 is a side elevation of thesame or a view looking in the direction ofarrow A in Fig. 1. Fig. 3 is an end elevation of the cutting extremity the core (not shown).

e wood-in.

of the device, or a view looking in the direction of arrow 3 Fig. 1. Fig. 4 is a section taken on the line 4-4 Fig. 3. Fig. 5 is a cross section taken on the ice 5-5 Fig. 2.

The samereference characters indicate the 5 same parts in all theyiews.

Let the numeraI S designate the hollow body of the auger; and 6 the shank which may be inserted in the ordinary brace (not shown) in the usual manner of bits, angers or other boring devices. The shank may of course be inserted in a chuck rotated in any suitable manner either b hand or other power. The body 5 is hol ow as shown at 7 and open on one side as shown at 8. The opening is'for'med by removing a segment of a cylinder, since if the openin 8 were closed, the body part would be of cy indrical shape. The opemngS extends from a point slightly above the cutting extremity 9 of the auger to the shoulder 10 of the shank. The cutting extremity is'provided with inclined cutters 12 which have sharp end edges 13 and longitudinal side edges 14. As shown in the drawing there are two of these cutters. The two cutters 12 perform the main boring function; they are located on opposite sides of the cutting head and cooperate to perform the said function. Between these out ters and oppositely located'are two pairs of teeth 15, the individual teeth of each pair are separated so that they occupy substantially the same arcs as the longitudinal side edges 14 of the cutters 12. These two pairs of teeth form cuts in the wood defining the annular groove formed by the cutters around In other words these teeth out the wood on opposite sides, and the cutters remove the portion of the wood between the cuts, forming the annular groove. The circle described by the inner teeth of each pair, defines the circumference of the plug to be removed.

' In Fig. 4 the annular groove is designated 16 and is indicated by dotted lines, while the plug, also indicated by dotted lines, is designated .17 while 18'is the piece of wood upon which the device 0 crates. The teeth 15 and the cutters 12 o the device, surround a central opening 19 which indicates the size of the lug or core formed by the operation of the evlce (see Fig. 3).

- From the foregoing descri tion the use and operation of my improve device will be readily understood. The cutting extremity of the auger is ap lied to the piece of wood 18 indicated by 0ttedlines. Now as this auger is rotated, an annular roove 16 is formed, by the cooperation of t e cutters 12 and the teeth 15, leaving the cylindrical plug 17 which enters the hollow 7 of the an or body. During the operation of the device the shavings may pass upwardly around the body and may also enter the hollow shank and pass out at the opening 8 in the side of the body. The lug or core 17 may also be removed throug this opening. After this plug is formed, it ma be cut into sections of suitable length for ing countersinks above screws or other fastening devices as heretofore explained.

Having thus described my invention, what I claim is:

In testimony whereof I allix my signature.

in presence of two witnesses.

' NILS E. SWANSQN. Witnesses: I

ROBERT F. OHLIN, A. J. OBRIEN. 

